using OrdinaryDiffEqLowStorageRK
using Trixi

###############################################################################
# semidiscretization of the polytropic Euler equations

gamma = 1.4
kappa = 0.5     # Scaling factor for the pressure.
equations = PolytropicEulerEquations2D(gamma, kappa)

initial_condition = initial_condition_convergence_test

volume_flux = flux_winters_etal
solver = DGSEM(polydeg = 3, surface_flux = FluxHLL(min_max_speed_davis),
               volume_integral = VolumeIntegralFluxDifferencing(volume_flux))

coordinates_min = (0.0, 0.0)
coordinates_max = (1.0, 1.0)

# Create a uniformly refined mesh with periodic boundaries
mesh = TreeMesh(coordinates_min, coordinates_max,
                initial_refinement_level = 2,
                periodicity = true)

semi = SemidiscretizationHyperbolic(mesh, equations, initial_condition, solver;
                                    source_terms = source_terms_convergence_test,
                                    boundary_conditions = boundary_condition_periodic)

###############################################################################
# ODE solvers, callbacks etc.

tspan = (0.0, 0.1)
ode = semidiscretize(semi, tspan)

summary_callback = SummaryCallback()

analysis_interval = 100
analysis_callback = AnalysisCallback(semi, interval = analysis_interval,
                                     extra_analysis_errors = (:l2_error_primitive,
                                                              :linf_error_primitive))

alive_callback = AliveCallback(analysis_interval = analysis_interval)

save_solution = SaveSolutionCallback(interval = 100,
                                     save_initial_solution = true,
                                     save_final_solution = true,
                                     solution_variables = cons2prim)

stepsize_callback = StepsizeCallback(cfl = 0.1)

callbacks = CallbackSet(summary_callback,
                        analysis_callback, alive_callback,
                        save_solution,
                        stepsize_callback)

###############################################################################
# run the simulation

sol = solve(ode, CarpenterKennedy2N54(williamson_condition = false);
            dt = 1, # solve needs some value here but it will be overwritten by the stepsize_callback
            ode_default_options()..., callback = callbacks);
